diff --git a/federationapi/internal/perform.go b/federationapi/internal/perform.go
index b888b365..8cd94434 100644
--- a/federationapi/internal/perform.go
+++ b/federationapi/internal/perform.go
@@ -392,17 +392,17 @@ func (r *FederationInternalAPI) performOutboundPeekUsingServer(
 
 	// we have the peek state now so let's process regardless of whether upstream gives up
 	ctx = context.Background()
-
 	respState := respPeek.ToRespState()
-	authEvents := respState.AuthEvents.UntrustedEvents(respPeek.RoomVersion)
+
 	// authenticate the state returned (check its auth events etc)
 	// the equivalent of CheckSendJoinResponse()
+	authEvents, _, err := respState.Check(ctx, respPeek.RoomVersion, r.keyRing, federatedAuthProvider(ctx, r.federation, r.keyRing, serverName))
+	if err != nil {
+		return fmt.Errorf("error checking state returned from peeking: %w", err)
+	}
 	if err = sanityCheckAuthChain(authEvents); err != nil {
 		return fmt.Errorf("sanityCheckAuthChain: %w", err)
 	}
-	if err = respState.Check(ctx, respPeek.RoomVersion, r.keyRing, federatedAuthProvider(ctx, r.federation, r.keyRing, serverName)); err != nil {
-		return fmt.Errorf("error checking state returned from peeking: %w", err)
-	}
 
 	// If we've got this far, the remote server is peeking.
 	if renewing {
diff --git a/go.mod b/go.mod
index f287fb9f..a34f8a57 100644
--- a/go.mod
+++ b/go.mod
@@ -38,7 +38,7 @@ require (
 	github.com/matrix-org/go-http-js-libp2p v0.0.0-20200518170932-783164aeeda4
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20210709140738-b0d1ba599a6d
 	github.com/matrix-org/gomatrix v0.0.0-20210324163249-be2af5ef2e16
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20220404174134-970e11ad2142
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20220405134050-301e340659d5
 	github.com/matrix-org/pinecone v0.0.0-20220404141326-e526fa82f79d
 	github.com/matrix-org/util v0.0.0-20200807132607-55161520e1d4
 	github.com/mattn/go-sqlite3 v1.14.10
@@ -64,7 +64,6 @@ require (
 	golang.org/x/image v0.0.0-20211028202545-6944b10bf410
 	golang.org/x/mobile v0.0.0-20220325161704-447654d348e3
 	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd
-	golang.org/x/sys v0.0.0-20220227234510-4e6760a101f9 // indirect
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
 	gopkg.in/h2non/bimg.v1 v1.1.5
 	gopkg.in/yaml.v2 v2.4.0
diff --git a/go.sum b/go.sum
index bbe109ff..c76f9c55 100644
--- a/go.sum
+++ b/go.sum
@@ -977,8 +977,8 @@ github.com/matrix-org/go-sqlite3-js v0.0.0-20210709140738-b0d1ba599a6d/go.mod h1
 github.com/matrix-org/gomatrix v0.0.0-20190528120928-7df988a63f26/go.mod h1:3fxX6gUjWyI/2Bt7J1OLhpCzOfO/bB3AiX0cJtEKud0=
 github.com/matrix-org/gomatrix v0.0.0-20210324163249-be2af5ef2e16 h1:ZtO5uywdd5dLDCud4r0r55eP4j9FuUNpl60Gmntcop4=
 github.com/matrix-org/gomatrix v0.0.0-20210324163249-be2af5ef2e16/go.mod h1:/gBX06Kw0exX1HrwmoBibFA98yBk/jxKpGVeyQbff+s=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20220404174134-970e11ad2142 h1:kkFKjbPn9oySI07bA3vVInFMjTRdMxASgwJXmABli4o=
-github.com/matrix-org/gomatrixserverlib v0.0.0-20220404174134-970e11ad2142/go.mod h1:+WF5InseAMgi1fTnU46JH39IDpEvLep0fDzx9LDf2Bo=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20220405134050-301e340659d5 h1:Fkennny7+Z/5pygrhjFMZbz1j++P2hhhLoT7NO3p8DQ=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20220405134050-301e340659d5/go.mod h1:V5eO8rn/C3rcxig37A/BCeKerLFS+9Avg/77FIeTZ48=
 github.com/matrix-org/pinecone v0.0.0-20220404141326-e526fa82f79d h1:1+T4eOPRsf6cr0lMPW4oO2k8TTHm4mqIh65kpEID5Rk=
 github.com/matrix-org/pinecone v0.0.0-20220404141326-e526fa82f79d/go.mod h1:ulJzsVOTssIVp1j/m5eI//4VpAGDkMt5NrRuAVX7wpc=
 github.com/matrix-org/util v0.0.0-20190711121626-527ce5ddefc7/go.mod h1:vVQlW/emklohkZnOPwD3LrZUBqdfsbiyO3p1lNV8F6U=
@@ -1727,8 +1727,8 @@ golang.org/x/sys v0.0.0-20211102192858-4dd72447c267/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220111092808-5a964db01320/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220227234510-4e6760a101f9 h1:nhht2DYV/Sn3qOayu8lM+cU1ii9sTLUeBQwQQfUHtrs=
-golang.org/x/sys v0.0.0-20220227234510-4e6760a101f9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220405052023-b1e9470b6e64 h1:D1v9ucDTYBtbz5vNuBbAhIMAGhQhJ6Ym5ah3maMVNX4=
+golang.org/x/sys v0.0.0-20220405052023-b1e9470b6e64/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
diff --git a/roomserver/internal/input/input_missing.go b/roomserver/internal/input/input_missing.go
index a7da9b06..2c958335 100644
--- a/roomserver/internal/input/input_missing.go
+++ b/roomserver/internal/input/input_missing.go
@@ -613,12 +613,13 @@ func (t *missingStateReq) lookupMissingStateViaState(
 		return nil, err
 	}
 	// Check that the returned state is valid.
-	if err := state.Check(ctx, roomVersion, t.keys, nil); err != nil {
+	authEvents, stateEvents, err := state.Check(ctx, roomVersion, t.keys, nil)
+	if err != nil {
 		return nil, err
 	}
 	parsedState := &parsedRespState{
-		AuthEvents:  make([]*gomatrixserverlib.Event, len(state.AuthEvents)),
-		StateEvents: make([]*gomatrixserverlib.Event, len(state.StateEvents)),
+		AuthEvents:  authEvents,
+		StateEvents: stateEvents,
 	}
 	// Cache the results of this state lookup and deduplicate anything we already
 	// have in the cache, freeing up memory.